Exponential Function of a bounded Linear Operator on a Hilbert Space. Baghdad Science Journal, Iraq, Baghdad, v. 11, n. 3, p. 1267–1273, 2014. DOI: 10.21123/bsj.2014.11.3.1267-1273. Disponível em: https://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/2017.. Acesso em: 18 may. 2024.